src/t_string.c

   1 #include <limits.h>
   2 #include "redis.h"
   3
   4 /*-----------------------------------------------------------------------------
   5  * String Commands
   6  *----------------------------------------------------------------------------*/
   7
   8 void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire) {
   9     int retval;
  10     long seconds = 0; /* initialized to avoid an harmness warning */
  11
  12     if (expire) {
  13         if (getLongFromObjectOrReply(c, expire, &seconds, NULL) != REDIS_OK)
  14             return;
  15         if (seconds <= 0) {
  16             addReplyError(c,"invalid expire time in SETEX");
  17             return;
  18         }
  19     }
  20
  21     retval = dbAdd(c->db,key,val);
  22     if (retval == REDIS_ERR) {
  23         if (!nx) {
  24             dbReplace(c->db,key,val);
  25             incrRefCount(val);
  26         } else {
  27             addReply(c,shared.czero);
  28             return;
  29         }
  30     } else {
  31         incrRefCount(val);
  32     }
  33     touchWatchedKey(c->db,key);
  34     server.dirty++;
  35     removeExpire(c->db,key);
  36     if (expire) setExpire(c->db,key,time(NULL)+seconds);
  37     addReply(c, nx ? shared.cone : shared.ok);
  38 }
  39
  40 void setCommand(redisClient *c) {
  41     c->argv[2] = tryObjectEncoding(c->argv[2]);
  42     setGenericCommand(c,0,c->argv[1],c->argv[2],NULL);
  43 }
  44
  45 void setnxCommand(redisClient *c) {
  46     c->argv[2] = tryObjectEncoding(c->argv[2]);
  47     setGenericCommand(c,1,c->argv[1],c->argv[2],NULL);
  48 }
  49
  50 void setexCommand(redisClient *c) {
  51     c->argv[3] = tryObjectEncoding(c->argv[3]);
  52     setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2]);
  53 }
  54
  55 int getGenericCommand(redisClient *c) {
  56     robj *o;
  57
  58     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL)
  59         return REDIS_OK;
  60
  61     if (o->type != REDIS_STRING) {
  62         addReply(c,shared.wrongtypeerr);
  63         return REDIS_ERR;
  64     } else {
  65         addReplyBulk(c,o);
  66         return REDIS_OK;
  67     }
  68 }
  69
  70 void getCommand(redisClient *c) {
  71     getGenericCommand(c);
  72 }
  73
  74 void getsetCommand(redisClient *c) {
  75     if (getGenericCommand(c) == REDIS_ERR) return;
  76     c->argv[2] = tryObjectEncoding(c->argv[2]);
  77     dbReplace(c->db,c->argv[1],c->argv[2]);
  78     incrRefCount(c->argv[2]);
  79     touchWatchedKey(c->db,c->argv[1]);
  80     server.dirty++;
  81     removeExpire(c->db,c->argv[1]);
  82 }
  83
  84 static int getBitOffsetFromArgument(redisClient *c, robj *o, size_t *offset) {
  85     long long loffset;
  86     char *err = "bit offset is not an integer or out of range";
  87
  88     if (getLongLongFromObjectOrReply(c,o,&loffset,err) != REDIS_OK)
  89         return REDIS_ERR;
  90
  91     /* Limit offset to SIZE_T_MAX or 1GB in bytes */
  92     if ((loffset < 0) ||
  93         ((unsigned long long)loffset >= (unsigned)SIZE_T_MAX) ||
  94         ((unsigned long long)loffset >> 3) >= (512*1024*1024))
  95     {
  96         addReplyError(c,err);
  97         return REDIS_ERR;
  98     }
  99
 100     *offset = (size_t)loffset;
 101     return REDIS_OK;
 102 }
 103
 104 void setbitCommand(redisClient *c) {
 105     robj *o;
 106     size_t bitoffset;
 107     int on;
 108
 109     if (getBitOffsetFromArgument(c,c->argv[2],&bitoffset) != REDIS_OK)
 110         return;
 111
 112     on = ((sds)c->argv[3]->ptr)[0] - '0';
 113     if (sdslen(c->argv[3]->ptr) != 1 || (on & ~1)) {
 114         addReplyError(c,"bit should be 0 or 1");
 115         return;
 116     }
 117
 118     o = lookupKeyWrite(c->db,c->argv[1]);
 119     if (o == NULL) {
 120         sds value = sdssetbit(sdsempty(),bitoffset,on);
 121         o = createObject(REDIS_STRING,value);
 122         dbAdd(c->db,c->argv[1],o);
 123     } else {
 124         if (checkType(c,o,REDIS_STRING)) return;
 125
 126         /* Create a copy when the object is shared or encoded. */
 127         if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
 128             robj *decoded = getDecodedObject(o);
 129             o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
 130             decrRefCount(decoded);
 131             dbReplace(c->db,c->argv[1],o);
 132         }
 133
 134         o->ptr = sdssetbit(o->ptr,bitoffset,on);
 135     }
 136     touchWatchedKey(c->db,c->argv[1]);
 137     server.dirty++;
 138     addReply(c,shared.cone);
 139 }
 140
 141 void getbitCommand(redisClient *c) {
 142     robj *o;
 143     size_t bitoffset, byte, bitmask;
 144     int on = 0;
 145     char llbuf[32];
 146
 147     if (getBitOffsetFromArgument(c,c->argv[2],&bitoffset) != REDIS_OK)
 148         return;
 149
 150     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
 151         checkType(c,o,REDIS_STRING)) return;
 152
 153     byte = bitoffset >> 3;
 154     bitmask = 1 << (7 - (bitoffset & 0x7));
 155     if (o->encoding != REDIS_ENCODING_RAW) {
 156         if (byte < (size_t)ll2string(llbuf,sizeof(llbuf),(long)o->ptr))
 157             on = llbuf[byte] & bitmask;
 158     } else {
 159         if (byte < sdslen(o->ptr))
 160             on = ((sds)o->ptr)[byte] & bitmask;
 161     }
 162     addReply(c, on ? shared.cone : shared.czero);
 163 }
 164
 165 void mgetCommand(redisClient *c) {
 166     int j;
 167
 168     addReplyMultiBulkLen(c,c->argc-1);
 169     for (j = 1; j < c->argc; j++) {
 170         robj *o = lookupKeyRead(c->db,c->argv[j]);
 171         if (o == NULL) {
 172             addReply(c,shared.nullbulk);
 173         } else {
 174             if (o->type != REDIS_STRING) {
 175                 addReply(c,shared.nullbulk);
 176             } else {
 177                 addReplyBulk(c,o);
 178             }
 179         }
 180     }
 181 }
 182
 183 void msetGenericCommand(redisClient *c, int nx) {
 184     int j, busykeys = 0;
 185
 186     if ((c->argc % 2) == 0) {
 187         addReplyError(c,"wrong number of arguments for MSET");
 188         return;
 189     }
 190     /* Handle the NX flag. The MSETNX semantic is to return zero and don't
 191      * set nothing at all if at least one already key exists. */
 192     if (nx) {
 193         for (j = 1; j < c->argc; j += 2) {
 194             if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
 195                 busykeys++;
 196             }
 197         }
 198     }
 199     if (busykeys) {
 200         addReply(c, shared.czero);
 201         return;
 202     }
 203
 204     for (j = 1; j < c->argc; j += 2) {
 205         c->argv[j+1] = tryObjectEncoding(c->argv[j+1]);
 206         dbReplace(c->db,c->argv[j],c->argv[j+1]);
 207         incrRefCount(c->argv[j+1]);
 208         removeExpire(c->db,c->argv[j]);
 209         touchWatchedKey(c->db,c->argv[j]);
 210     }
 211     server.dirty += (c->argc-1)/2;
 212     addReply(c, nx ? shared.cone : shared.ok);
 213 }
 214
 215 void msetCommand(redisClient *c) {
 216     msetGenericCommand(c,0);
 217 }
 218
 219 void msetnxCommand(redisClient *c) {
 220     msetGenericCommand(c,1);
 221 }
 222
 223 void incrDecrCommand(redisClient *c, long long incr) {
 224     long long value;
 225     robj *o;
 226
 227     o = lookupKeyWrite(c->db,c->argv[1]);
 228     if (o != NULL && checkType(c,o,REDIS_STRING)) return;
 229     if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return;
 230
 231     value += incr;
 232     o = createStringObjectFromLongLong(value);
 233     dbReplace(c->db,c->argv[1],o);
 234     touchWatchedKey(c->db,c->argv[1]);
 235     server.dirty++;
 236     addReply(c,shared.colon);
 237     addReply(c,o);
 238     addReply(c,shared.crlf);
 239 }
 240
 241 void incrCommand(redisClient *c) {
 242     incrDecrCommand(c,1);
 243 }
 244
 245 void decrCommand(redisClient *c) {
 246     incrDecrCommand(c,-1);
 247 }
 248
 249 void incrbyCommand(redisClient *c) {
 250     long long incr;
 251
 252     if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
 253     incrDecrCommand(c,incr);
 254 }
 255
 256 void decrbyCommand(redisClient *c) {
 257     long long incr;
 258
 259     if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
 260     incrDecrCommand(c,-incr);
 261 }
 262
 263 void appendCommand(redisClient *c) {
 264     int retval;
 265     size_t totlen;
 266     robj *o, *append;
 267
 268     o = lookupKeyWrite(c->db,c->argv[1]);
 269     c->argv[2] = tryObjectEncoding(c->argv[2]);
 270     if (o == NULL) {
 271         /* Create the key */
 272         retval = dbAdd(c->db,c->argv[1],c->argv[2]);
 273         incrRefCount(c->argv[2]);
 274         totlen = stringObjectLen(c->argv[2]);
 275     } else {
 276         if (o->type != REDIS_STRING) {
 277             addReply(c,shared.wrongtypeerr);
 278             return;
 279         }
 280
 281         append = getDecodedObject(c->argv[2]);
 282         if (o->encoding == REDIS_ENCODING_RAW &&
 283             (sdslen(o->ptr) + sdslen(append->ptr)) > 512*1024*1024)
 284         {
 285             addReplyError(c,"string exceeds maximum allowed size (512MB)");
 286             decrRefCount(append);
 287             return;
 288         }
 289
 290         /* If the object is shared or encoded, we have to make a copy */
 291         if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
 292             robj *decoded = getDecodedObject(o);
 293             o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
 294             decrRefCount(decoded);
 295             dbReplace(c->db,c->argv[1],o);
 296         }
 297
 298         /* Append the value */
 299         o->ptr = sdscatlen(o->ptr,append->ptr,sdslen(append->ptr));
 300         decrRefCount(append);
 301         totlen = sdslen(o->ptr);
 302     }
 303     touchWatchedKey(c->db,c->argv[1]);
 304     server.dirty++;
 305     addReplyLongLong(c,totlen);
 306 }
 307
 308 void substrCommand(redisClient *c) {
 309     robj *o;
 310     long start = atoi(c->argv[2]->ptr);
 311     long end = atoi(c->argv[3]->ptr);
 312     size_t rangelen, strlen;
 313     sds range;
 314
 315     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
 316         checkType(c,o,REDIS_STRING)) return;
 317
 318     o = getDecodedObject(o);
 319     strlen = sdslen(o->ptr);
 320
 321     /* convert negative indexes */
 322     if (start < 0) start = strlen+start;
 323     if (end < 0) end = strlen+end;
 324     if (start < 0) start = 0;
 325     if (end < 0) end = 0;
 326
 327     /* indexes sanity checks */
 328     if (start > end || (size_t)start >= strlen) {
 329         /* Out of range start or start > end result in null reply */
 330         addReply(c,shared.nullbulk);
 331         decrRefCount(o);
 332         return;
 333     }
 334     if ((size_t)end >= strlen) end = strlen-1;
 335     rangelen = (end-start)+1;
 336
 337     /* Return the result */
 338     addReplySds(c,sdscatprintf(sdsempty(),"$%zu\r\n",rangelen));
 339     range = sdsnewlen((char*)o->ptr+start,rangelen);
 340     addReplySds(c,range);
 341     addReply(c,shared.crlf);
 342     decrRefCount(o);
 343 }
 344
 345 void strlenCommand(redisClient *c) {
 346     robj *o;
 347
 348     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
 349         checkType(c,o,REDIS_STRING)) return;
 350
 351     o = getDecodedObject(o);
 352     addReplyLongLong(c,sdslen(o->ptr));
 353     decrRefCount(o);
 354 }